Detecting Falling Pieces of Paper
hi all,
i've got problem want solve on bug list , searches haven't brought answers. i've been using parallax pir (http://www.parallax.com/product/555-28027) detect motion. easy use , reliable can recommend them.
one thing can't detect though falling sheets of paper. 1 application i've been asked detecting when children drop wishes written on paper wishing well. pir isn't sensitive enough pick i'm wondering if has ideas? ideally don't want add paper detect motion using rfid etc won't work, want want ultra sensitive motion sensor…
thanks advice!
i've got problem want solve on bug list , searches haven't brought answers. i've been using parallax pir (http://www.parallax.com/product/555-28027) detect motion. easy use , reliable can recommend them.
one thing can't detect though falling sheets of paper. 1 application i've been asked detecting when children drop wishes written on paper wishing well. pir isn't sensitive enough pick i'm wondering if has ideas? ideally don't want add paper detect motion using rfid etc won't work, want want ultra sensitive motion sensor…
thanks advice!
perhaps ultra sonic sensor might work, might not.
http://arduino.cc/en/tutorial/ping
using laser beams perhaps ?
is whishing dark below ? can use number of ir leds, , detect reflectance or interruption of ir. after second thought, think ir work.
you don't want disappoint children, perhaps can combine sensors. or add sign children larger paper needed.
will rain have influence ? or indoors ?
http://arduino.cc/en/tutorial/ping
using laser beams perhaps ?
is whishing dark below ? can use number of ir leds, , detect reflectance or interruption of ir. after second thought, think ir work.
you don't want disappoint children, perhaps can combine sensors. or add sign children larger paper needed.
will rain have influence ? or indoors ?
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